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- Those NS/EP telecommunications services utilizing public switched networks. Note: Public switched NS/EP telecommunication services may include both interexchange and intraexchange network facilities (e.g., switching systems, interoffice trunks, and subscriber loops).
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- AMTS, BETRS, idle state, outage, private NS/EP telecommunications services, public switched NS/EP telecommunications services, telecommunication administration, telecommunication sector, telecommunications facilities, telecommunications service, telecommunications system, telecommunications system operator, telephoto, teleservice, universal service, value-added network (VAN)